The L165 opamp I used turned out to be too slow, so I made a new pcb with different opamps. This time I used 2x THS3112.
Yes, the voltage regulators are not mounted straight .
Because I had no 7909 I used a 7905 with a 4.7V zener, this way I get -9,7V.
This pcb is not tested yet, so I don’t know if it works.